Sirloin
Ryggbiff
55°CRest 5 min
Pull temperature for medium rare
Render the fat edge first, standing it on its side.
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Safe minimum 63°CUSDA
Tap another part of the cow to jump to it
On the grill
Stand it on the fat edge over the coals for the first minute. Rendered strip fat is the best thing about this cut and it will not render lying flat.
Then direct heat, two or three turns, and a proper rest. Slice against the grain, which runs the length of the strip.